1 files changed, 68 insertions, 0 deletions
diff --git a/dgbuilder/public/red/ui/keyboard.js b/dgbuilder/public/red/ui/keyboard.js
new file mode 100644
index 00000000..3bc28c4d
--- /dev/null
+++ b/dgbuilder/public/red/ui/keyboard.js
@@ -0,0 +1,68 @@
+/**
+ * Copyright 2013 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+RED.keyboard = (function() {
+
+    var active = true;
+    var handlers = {};
+
+    d3.select(window).on("keydown",function() {
+        if (!active) { return; }
+        var handler = handlers[d3.event.keyCode];
+        if (handler && handler.ondown) {
+            if (!handler.modifiers ||
+                ((!handler.modifiers.shift || d3.event.shiftKey) &&
+                 (!handler.modifiers.ctrl  || d3.event.ctrlKey ) &&
+                 (!handler.modifiers.alt   || d3.event.altKey  ) )) {
+                handler.ondown();
+            }
+        }
+    });
+    d3.select(window).on("keyup",function() {
+        if (!active) { return; }
+        var handler = handlers[d3.event.keyCode];
+        if (handler && handler.onup) {
+            if (!handler.modifiers ||
+                ((!handler.modifiers.shift || d3.event.shiftKey) &&
+                 (!handler.modifiers.ctrl  || d3.event.ctrlKey ) &&
+                 (!handler.modifiers.alt   || d3.event.altKey  ) )) {
+                handler.onup();
+            }
+        }
+    });
+    function addHandler(key,modifiers,ondown,onup) {
+        var mod = modifiers;
+        var cbdown = ondown;
+        var cbup = onup;
+
+        if (typeof modifiers == "function") {
+            mod = {};
+            cbdown = modifiers;
+            cbup = ondown;
+        }
+        handlers[key] = {modifiers:mod, ondown:cbdown, onup:cbup};
+    }
+    function removeHandler(key) {
+        delete handlers[key];
+    }
+
+    return {
+        add: addHandler,
+        remove: removeHandler,
+        disable: function(){ active = false;},
+        enable: function(){ active = true; }
+    }
+
+})();